attribute vec4 position; //输入参数1 （位置坐标）
attribute vec2 textCoordinate;  //输入参数2 (纹理坐标)

varying lowp vec2 varyTextCoord; //纹理坐标
//varying lowp vec2 varyTextCoord2;

void main()
{ 
    varyTextCoord  = vec2(textCoordinate.x,1.0-textCoordinate.y); //解决纹理上下颠倒的问题 
    gl_Position = position ;
}
